Javascript vs. Ruby

Ruby would be better for teaching children how to program, is good for prototyping, is flexible, expressive, good for short iterations. There is lots of open-source code and it has a coherent design. More people find that Javascript is more efficient, but has annoying syntax, is hard to replace with other languages, but burns out developers who use if for a few years.

But if this overview is right, and I might not understand it entirely, Javascript is way, way faster than Ruby. But it terms of memory use, Ruby is better.